CN112116875A - Foldable display module - Google Patents

Foldable display module Download PDF

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Publication number
CN112116875A
CN112116875A CN202011088855.6A CN202011088855A CN112116875A CN 112116875 A CN112116875 A CN 112116875A CN 202011088855 A CN202011088855 A CN 202011088855A CN 112116875 A CN112116875 A CN 112116875A
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CN
China
Prior art keywords
display module
flexible
folding area
foldable display
support layer
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Pending
Application number
CN202011088855.6A
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Chinese (zh)
Inventor
周岐元
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Original Assignee
Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Publication date
Application filed by Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd filed Critical Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority to CN202011088855.6A priority Critical patent/CN112116875A/en
Priority to US17/265,085 priority patent/US11714456B2/en
Priority to PCT/CN2020/129305 priority patent/WO2022077689A1/en
Publication of CN112116875A publication Critical patent/CN112116875A/en
Pending legal-status Critical Current

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    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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    • G06F1/1641—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being formed by a plurality of foldable display components
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    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
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Abstract

The application provides a foldable display module, which comprises a folding area and non-folding areas positioned on two sides of the folding area; the foldable display module comprises a flexible display panel and a flexible supporting layer arranged on the back of the flexible display panel; the thickness of the flexible supporting layer is 150-1000 microns, and the thickness of the flexible supporting layer corresponding to the folding area is smaller than that of the flexible supporting layer corresponding to the non-folding area. The folding area thinning processing single film layer is adopted to replace the stacking design of a back plate-foam-metal supporting layer which is mainstream on the existing folding device, so that the material and manufacturing cost of the existing folding device are effectively reduced.

Description

Foldable display module
Technical Field
The application relates to the technical field of display, especially, relate to a collapsible display module assembly.
Background
An Organic Light Emitting Diode (OLED) has high response speed, wide viewing angle, high brightness, low power consumption, and excellent bending resistance, and is one of the hot spots in the field of flexible display. At present, due to the bottleneck of materials and technology, the small-radius dynamic folding flexible display screen has the problems of poor film layer stripping, scratch, wrinkle, poor pen and ball dropping performance and the like. Each mainstream panel factory attempts to improve these problems by optimizing the display panel stacking design, and the main improvement method is to add functional layers such as a backplane (backplane), Foam (Foam), a metal sheet (metal sheet) and the like on the non-display surface of the panel. As shown in fig. 1, the dynamically folded flexible display screen adds three functional layer materials, namely, a back plate 2(50um), a foam 3(150um) and a metal support layer 4(150um), which have a total thickness of 350um, to the non-display surface of the display panel 1 to provide support, buffering and improvement of bending strength for the display panel 1. Although the method can effectively improve various performances of the display panel, the use of the functional film and the adhesive (such as PSA and OCA) for bonding the functional film is greatly increased, so that the manufacturing procedure of the dynamic folding display screen is greatly increased, and the production cost is high.
Therefore, the prior art has defects which need to be solved urgently.
Disclosure of Invention
The application provides a collapsible display module assembly, can solve the higher problem of material and the manufacturing cost of current collapsible device.
In order to solve the above problems, the technical solution provided by the present application is as follows:
the application provides a foldable display module, which comprises a folding area and non-folding areas positioned on two sides of the folding area;
the foldable display module comprises a flexible display panel and a flexible supporting layer arranged on the back of the flexible display panel;
the thickness of the flexible support layer is 150-1000 microns, and the thickness of the flexible support layer corresponding to the folding area is smaller than that of the flexible support layer corresponding to the non-folding area.
In the foldable display module of this application, the hardness of flexible supporting layer is 1.5H-8H.
In the foldable display module of the present application, the hardness of the flexible supporting layer is 3H-6H.
In the foldable display module of the present application, the young's modulus of the flexible supporting layer is greater than or equal to 3 GPa.
In the foldable display module of this application, the thickness that the flexible supporting layer corresponds the folding district is less than 100 microns, and is greater than 2 microns.
In the foldable display module of the present application, the material of the flexible supporting layer includes at least one of polyimide, polyetheretherketone, polyterephthalic acid, and polyamide; or the material of the flexible supporting layer is a metal material.
In the foldable display module of this application, the thickness of the flexible supporting layer corresponding to the folding region is reduced from the middle part of the folding region to both sides.
In the foldable display module of the application, the part of the flexible supporting layer corresponding to the folding area comprises a first inclined plane and a second inclined plane which are symmetrically arranged along the central line of the folding area, and the first inclined plane and the second inclined plane are intersected at the position of the central line of the folding area.
In the foldable display module of the application, the part of the flexible supporting layer corresponding to the folding area comprises a first cambered surface and a second cambered surface which are symmetrically arranged along the central line of the folding area, and the first cambered surface is intersected with the second cambered surface at the position of the central line of the folding area.
In the foldable display module of this application, flexible supporting layer dorsad one side of flexible display panel is provided with the heat dissipation layer, the heat dissipation layer corresponds the setting of non-folding district.
The beneficial effect of this application does: the application provides a foldable display module set sets up the flexible supporting layer that thickness is 150 microns to 1000 microns at flexible display panel's back, and this flexible supporting layer is less than the thickness that corresponds non-folding district at the thickness that corresponds folding district. According to the foldable display module, the single film layer (namely the flexible supporting layer) subjected to thinning treatment in the folding area is adopted to replace the stacking design of the mainstream back plate-foam-metal supporting layer on the existing foldable device, so that the material and manufacturing cost of the existing foldable device can be effectively reduced on the basis of not influencing the bending performance of the foldable display module.
Drawings
The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a conventional dynamically-folded flexible display screen;
fig. 2 is a schematic structural diagram of a foldable display module according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a foldable display module according to a second embodiment of the present application;
fig. 4 is a schematic structural diagram of a foldable display module according to a third embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," and the like are used in the orientation or positional relationship indicated in the drawings, which are based on the orientation or positional relationship shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The present application may repeat reference numerals and/or letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed.
Referring to fig. 2 and 4, the foldable display module of the present application includes a folding area a and non-folding areas B located at two sides of the folding area a. The foldable display module comprises a flexible display panel 201 and a flexible support layer 202 arranged on the back of the flexible display panel 201, wherein the flexible support layer 202 is used for providing a supporting and buffering effect for the flexible display panel 201 and improving the bending strength of the foldable display module.
The flexible display panel 201 may be an organic electroluminescent display panel, a liquid crystal display panel, or a quantum dot display panel.
The thickness of the flexible support layer 202 of the present application is 150 micrometers to 1000 micrometers, and may be, for example, 300 micrometers, 500 micrometers, 700 micrometers, 900 micrometers, or the like. The flexible support layer 202 with the thickness within the range can provide enough support force for the flexible display panel 201, so that the flexible display panel 201 is in a flat state when the foldable display module is unfolded. Meanwhile, the thickness of the flexible supporting layer 202 corresponding to the folding area a is smaller than the thickness of the non-folding area B, and the thickness of the portion of the flexible supporting layer 202 corresponding to the folding area a is thinned, so that the flexible supporting layer 202 has good bending performance in the folding area a.
The flexible supporting layer 202 of the single film structure is used for replacing the folding design of the mainstream back plate-foam-metal supporting layer on the existing foldable device, and the back plate-foam-metal supporting layer in the existing foldable device is bonded through the adhesive layer, so that the use of functional materials and multiple adhesive layers is reduced, at least three laminating processes are reduced, and the material and manufacturing cost of the existing foldable device can be effectively reduced.
The foldable display module of the present application will be described in detail with reference to specific embodiments.
Example one
Fig. 2 is a schematic structural diagram of a foldable display module according to an embodiment of the present application. The foldable display module comprises a flexible display panel 201, the front of the flexible display panel 201 is a display surface, and the back of the flexible display panel 201 is a non-display surface. The flexible display panel 201 is characterized in that a flexible supporting layer 202 and a heat dissipation layer 203 are sequentially stacked on one side of a non-display surface of the flexible display panel 201 from top to bottom, and a touch panel 204, a polarizer 205, a flexible cover plate 206 and a protective film 207 are sequentially stacked on one side of a display surface of the flexible display panel 201 from bottom to top. And, two adjacent film layers are adhered to each other by the adhesive layer 208.
In this embodiment, the thickness of the flexible support layer 202 may be 300 microns. Specifically, the thickness of the flexible support layer 202 corresponding to the non-folding region B is 300 micrometers, and the thickness of the flexible support layer 202 corresponding to the folding region a is less than 100 micrometers.
However, in order to ensure that the flexible supporting layer 202 of the folding area a can provide a certain supporting force for the foldable display module, prevent the portion of the foldable display module corresponding to the folding area a from sinking or being uneven after being unfolded, and prevent a "blank" feeling from being generated at the position corresponding to the folding area a when the foldable display module is touched, it is preferable that the thickness of the flexible supporting layer 202 corresponding to the folding area a is less than 100 micrometers and greater than 2 micrometers.
Further, the thickness of the flexible support layer 202 corresponding to the folding area a is 50 micrometers, and after the flexible support layer 202 is thinned in the folding area a, the bending strength of the foldable display module can be effectively improved.
In this embodiment, the hardness of the flexible supporting layer 202 ranges from 1.5H to 8H, which can provide good supporting performance. The thickness of the flexible support layer 202 is greater when the stiffness is lower; the greater the stiffness of the flexible support layer 202, the smaller its thickness.
Further, the hardness of the flexible supporting layer 202 ranges from 3H to 6H. For example, the flexible support layer 202 may have a hardness of 3H, 4H, 4.5H, 5H, 6H, etc.
In one embodiment, when the hardness of the flexible support layer 202 is 3H-4.5H, the thickness of the flexible support layer 202 may be 600 micrometers to 1000 micrometers; when the hardness of the flexible support layer 202 is 4.5H-6H, the thickness of the flexible support layer 202 may be 150 micrometers to 600 micrometers.
It is understood that as the stiffness of the flexible support layer 202 is lower, the thickness of the flexible support layer 202 at the corresponding fold region a is also higher; the greater the stiffness of the flexible support layer 202, the less the thickness of the flexible support layer 202 at the corresponding fold region a. By properly adjusting the thickness of the flexible support layer 202 according to the hardness of the flexible support layer 202, the flexible support layer 202 has both excellent supporting performance and excellent bending performance.
In this embodiment, the young's modulus of the flexible support layer 202 is 3GPa or more, and may be, for example, 4GPa, 5GPa, 6GPa, 7GPa, or the like. Therefore, the flexible supporting layer 202 has good bending strength, the bending performance of the foldable display module is improved, and the risks of cracks, folds, film peeling and the like generated in the repeated bending process of the foldable display module are avoided. Meanwhile, the flexible supporting layer 202 of the embodiment has a better impact resistance, for example, when the young modulus of the flexible supporting layer 202 is 3GPa to 7GPa, the impact resistance of the flexible supporting layer 202 can be improved, so as to improve the ball and pen dropping performance.
In the foldable display module, when the external instant local impact force acts on the foldable display module and is transmitted to the flexible support layer 202, the impact force is absorbed by the flexible support layer 202 and is converted into deformation energy, so that the impact force is prevented from being continuously transmitted to one side of the flexible display panel 201, and the impact resistance of the foldable display module is improved.
Wherein, the material of the flexible support layer 202 may include at least one of polyimide, polyetheretherketone, polyterephthalic acid, and polyamide; alternatively, the material of the flexible support layer 202 may be a metal material.
The foldable display module of this embodiment integrates display and touch control, and certainly, in other embodiments, the foldable display module may not include the touch panel 204.
Since the flexible display panel 201 generates a large amount of heat during use, the generated heat, if not discharged in time, may affect the display performance of the flexible display panel 201. Therefore, a side of the flexible support layer 202 facing away from the flexible display panel 201 is provided with a heat dissipation layer 203. In order not to affect the bending performance of the foldable display module, the heat dissipation layer 203 is disposed corresponding to the non-folding area B, and the folding area a is not disposed with the heat dissipation layer 203.
The heat dissipation layer 203 includes a first heat dissipation layer 2031 and a second heat dissipation layer 2032, which are stacked, and the material of the first heat dissipation layer 2031 may be a metal material, such as copper, which facilitates heat conduction. The second heat dissipation layer 2032 may be made of a metal material or a non-metal material. The thickness of the heat dissipation layer 203 is 80 micrometers to 100 micrometers, and the thickness of the first heat dissipation layer 2031 may be 50 micrometers.
In this embodiment, the thickness of the touch panel 204 may be 3 micrometers, the thickness of the polarizer 205 may be 28 micrometers, the thickness of the flexible cover 206 may be 10 micrometers to 40 micrometers, and the thickness of the protective film 207 may be 50 micrometers. The thickness of the adhesive layer 208 between the flexible display panel 201 and the flexible support layer 202 may be 25 micrometers, the thickness of the adhesive layer 208 between the touch panel 204 and the polarizer 205 may be 40 micrometers, the thickness of the adhesive layer 208 between the polarizer 205 and the flexible cover 206 may be 50 micrometers, and the thickness of the adhesive layer 208 between the flexible cover 206 and the protective film 207 may be 25 micrometers.
In this embodiment, the flexible supporting layer 202 for thinning the folding area is used to replace the stacked structure design of the back plate-foam-metal supporting layer on the conventional foldable device, and the application reduces the functional film layers and thins the folding area, so that the foldable display module can be bent more easily, and the problems of the conventional foldable device, such as too large bending radius, easy peeling of the film layer, poor performance of wrinkles and falling balls due to too many functional film layers, and the like, can be solved.
Example two
Fig. 3 is a schematic structural diagram of a foldable display module according to a second embodiment of the present application. The foldable display module of this embodiment is the same/similar to the foldable display module of the first embodiment, except that: in this embodiment, the flexible support layer 202 of the folding area a is thinned in a manner that facilitates folding patterning thinning, that is, the flexible support layer 202 of the folding area a is provided with unequal thickness, and the thickness of the flexible support layer 202 corresponding to the folding area a decreases from the middle of the folding area a to both sides.
Specifically, the folding mode of the foldable display module is a folded-in type. The portion of the flexible support layer 202 corresponding to the folding area a and the rest are continuous film layers, the portion of the flexible support layer 202 corresponding to the folding area a includes a first inclined surface 202a and a second inclined surface 202b, the first inclined surface 202a and the second inclined surface 202b are symmetrically disposed along a center line C of the folding area a, and the first inclined surface 202a and the second inclined surface 202b intersect at the center line C of the folding area a.
The thickness of the flexible support layer 202 corresponding to the folding area a is gradually reduced from the middle of the folding area a to both sides, and the thickness of the thinnest part of the flexible support layer 202 is greater than 2 mm, and may be, for example, 10 mm to 20 mm.
Compared with the foldable display module in the first embodiment, in the foldable display module in this embodiment, because the outer surface of the flexible supporting layer 202 of the folding area a is designed to be two symmetrical inclined planes facing the folding direction, the bending stress of the foldable display module can be reduced, which is more beneficial to the bending of the foldable display module.
EXAMPLE III
Fig. 4 is a schematic structural diagram of a foldable display module according to a third embodiment of the present application. The foldable display module of this embodiment is the same/similar to the foldable display module of the first embodiment, except that: in this embodiment, the flexible support layer 202 of the folding zone a is thinned in a manner that facilitates the patterned thinning of the folding, that is, the thickness of the flexible support layer 202 corresponding to the folding zone a decreases from the middle of the folding zone a to both sides.
Specifically, the portion of the flexible supporting layer 202 corresponding to the folding area a and the rest are continuous film layers, the portion of the flexible supporting layer 202 corresponding to the folding area a includes a first arc surface 202C and a second arc surface 202d, the first arc surface 202C and the second arc surface 202d are symmetrically disposed along a center line C of the folding area a, and the first arc surface 202C and the second arc surface 202d intersect at the center line C of the folding area a.
The first arc surface 202C and the second arc surface 202d may be two parts of the same arc surface divided along the center line C.
Compared with the foldable display module in the first embodiment, in the foldable display module in this embodiment, because the outer surface of the flexible supporting layer 202 of the folding area a is designed to be the arc surface bending towards the folding direction, the bending stress of the foldable display module can be reduced, which is more beneficial to the bending of the foldable display module.
In other embodiments, the cross-sectional shape of the outer surface of the flexible support layer 202 in the folding area a may also be wavy, zigzag, or the like, without limitation.
The application utilizes the three-layer laminated structure of the flexible supporting layer 202 to replace a back plate, a foam and a metal supporting layer on the existing foldable device, can reduce the film quantity of the foldable display module and the use of materials, thereby saving the cost and solving the problems that the bending radius is too large, the film is easy to peel off, wrinkles and the like caused by too many functional film layers of the existing foldable device. In addition, through the optimal design to flexible supporting layer 202 structure, can improve collapsible display module's the performance of buckling, solve the pen and fall the ball performance subalternation problem.
In summary, although the present application has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present application, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, so that the scope of the present application shall be determined by the appended claims.

Claims (10)

1. The foldable display module is characterized by comprising a folding area and non-folding areas positioned on two sides of the folding area;
the foldable display module comprises a flexible display panel and a flexible supporting layer arranged on the back of the flexible display panel;
the thickness of the flexible support layer is 150-1000 microns, and the thickness of the flexible support layer corresponding to the folding area is smaller than that of the flexible support layer corresponding to the non-folding area.
2. The foldable display module of claim 1, wherein the flexible support layer has a stiffness of 1.5H-8H.
3. The foldable display module of claim 2, wherein the flexible support layer has a stiffness of 3H to 6H.
4. The foldable display module of claim 1, wherein the young's modulus of the flexible support layer is greater than or equal to 3 GPa.
5. The foldable display module of claim 1, wherein the thickness of the flexible support layer corresponding to the folding area is less than 100 micrometers and greater than 2 micrometers.
6. The foldable display module of claim 1, wherein the material of the flexible support layer comprises at least one of polyimide, polyetheretherketone, poly (terephthalic acid), and polyamide; or the material of the flexible supporting layer is a metal material.
7. The foldable display module of claim 1, wherein the thickness of the flexible support layer corresponding to the folding area decreases from the middle of the folding area to both sides.
8. The foldable display module of claim 7, wherein the portion of the flexible support layer corresponding to the folding area comprises a first inclined surface and a second inclined surface symmetrically disposed along a central line of the folding area, and the first inclined surface intersects with the second inclined surface at a position of the central line of the folding area.
9. The foldable display module of claim 7, wherein the portion of the flexible supporting layer corresponding to the folding area comprises a first arc surface and a second arc surface symmetrically disposed along a central line of the folding area, and the first arc surface intersects with the second arc surface at a position of the central line of the folding area.
10. The foldable display module of claim 1, wherein a heat dissipation layer is disposed on a side of the flexible support layer opposite to the flexible display panel, and the heat dissipation layer is disposed corresponding to the non-folding area.
CN202011088855.6A 2020-10-13 2020-10-13 Foldable display module Pending CN112116875A (en)

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